Xll 



TABLE OF CONTENTS 



PART II 



XVI. The Influence of Light on the Development of 



Organs in Animals 425 



XVII. Has the Central Nervous System Any Influence 



upon the Metamorphosis of Larvae? 436 



XVIII. On the Theory of Galvanotropism 440 



XIX. The Physiological Effects of Ions. I 450 



XX. On the Physiological Effects of Electrical Waves 482 



XXI. The Physiological Problems of Today - 497 



XXII. The Physiological Effects of Ions. II - 501 



XXIII. Why Is Regeneration of Protoplasmic Fragments 



without a Nucleus Difficult or Impossible ? 505 



XXIV. On the Similarity between the Absorption of Water 



by Muscles and by Soaps - 510 



XXV. On Ions Which Are Capable of Calling Forth 



Rhythmical Contractions in Skeletal Muscle 518 



XXVI. On the Nature of the Process of Fertilization and 

 the Artificial Production of Normal Larvae 

 (Plutei) from the Unfertilized Eggs of the Sea- 

 Urchin 539 



XXVII. On lon-Proteid Compounds and Their Role in the 

 Mechanics of Life-Phenomena. The Poison- 

 ous Character of a Pure NaCl Solution 544 



XXVIII. On the Different Effects of Ions upon Myogenic 

 and Neurogenic Rhythmical Contractions and 

 upon Embryonic and Muscular Tissue 559 



XXIX. On the Artificial Production of Normal Larvae from 

 the Unfertilized Eggs of the Sea -Urchin 

 (Arbacia) - 576 



XXX. On Artificial Parthenogenesis in Sea-Urchins 624 



XXXI. On the Transformation and Regeneration of Organs 627 



XXXII. Further Experiments on Artificial Parthenogenesis 



and the Nature of the Process of Fertilization - 638 



